package com.leyou.item.dto;

import com.leyou.common.entity.BaseEntity;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.NoArgsConstructor;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;


@Data
@NoArgsConstructor
@EqualsAndHashCode(callSuper = true)
public class SpecGroupDTO extends BaseDTO {
    private Long id;
    private Long categoryId;
    private String name;

    private List<SpecParamDTO> params;

    public SpecGroupDTO(BaseEntity entity) {
        super(entity);
    }

    /**
     * 将PO集合转为DTO集合
     * @param list PO对象的集合
     * @param <T> PO的类型
     * @return DTO集合
     */
    public static <T extends BaseEntity> List<SpecGroupDTO> convertEntityList(Collection<T> list){
        if(list == null){
            return Collections.emptyList();
        }
        //map()方法会出现隐式传参，传入的就是被遍历的每个元素对象
        return list.stream().map(SpecGroupDTO::new).collect(Collectors.toList());
    }
}